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Sara Berg, a Wisconsin nurse's assistant. and her cousin, Lisa Meier, gave CPR to Victor Giesbrecht, who went into cardiac arrest minutes after he stopped on a highway to change their tire. (Mayo Clinic Health System via Associated Press)

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.